Is Symbol a text field? If it isn't, you can't use Like at all since Like implies a text field and you will get incorrect results if you are comparing to a numeric value or date.
Are you really passing a partial string?
Like is very inefficient so you never want to use it unless you actually need it.

If you are using Like because you want the symbol to be optional, then do the following instead:

Quip doubles as a “living” wiki and a project management tool that evolves with your organization. As you finish projects in Quip, the work remains, easily accessible to all team members, new and old.
- Increase transparency
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- Access from mobile/offline

The first two articles in this short series — Using a Criteria Form to Filter Records (http://www.experts-exchange.com/A_6069.html) and Building a Custom Filter (http://www.experts-exchange.com/A_6070.html) — discuss in some detail how a form can be…

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